The ML4903 controller, when combined with two external MOSFETs, generates output voltages between 1.8V and 3.5V from a 12V supply. The output voltage is selected via an internal 2 chord 4-bit DAC. In the upper range, the output can be set between 2.1V and 3.5V in 100mV steps. In the lower range, the output can be set between 1.8V and 2.05V in 50mV steps. Output currents in excess of 20A can be attained at efficiencies greater than 80%.